bug#61667: 29.0.60; Failure to redisplay

[Po Lu]

Dmitry Gutov <dgutov@yandex.ru> writes:

> On 21/02/2023 12:19, Po Lu wrote:
>> Dmitry Gutov <dgutov@yandex.ru> writes:
>> 
>>> Hovering the mouse over the mode-line does trigger the necessary
>>> redisplay. Alt-Tabbing to another window and then back also does
>>> that. Is that relevant?
>>>
>>> Simply moving the mouse (not over the mode-line) doesn't help.
>>>
>>> The refresh can also happen on its own, in 1-2 seconds.
>> I think this isn't a problem with the GLib input code then.
>> Alt-tabbing makes the X event reading code explicitly ask for a
>> redisplay.  If you build --with-checking=yes,glyphs and call
>> `trace-redisplay', what happens when the redisplay does not happen?
>
> Okay, I've rebuilt with --enable-checking=glyphs.
>
> With --eval '(trace-redisplay t)', redisplay always happens. ;-(
>
> That's not the effect of 'checking', though -- I can still repro if I
> don't turn on redisplay tracing (which prints stuff in the background
> window; maybe it's relevant, maybe it's not).

No idea why that is, sorry.  Perhaps Eli knows better.